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Commit | Line | Data |
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726f6388 JA |
1 | /* general.c -- Stuff that is used by all files. */ |
2 | ||
a0c0a00f | 3 | /* Copyright (C) 1987-2016 Free Software Foundation, Inc. |
726f6388 JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
3185942a JA |
7 | Bash is free software: you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
726f6388 | 11 | |
3185942a JA |
12 | Bash is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
726f6388 | 16 | |
3185942a JA |
17 | You should have received a copy of the GNU General Public License |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
726f6388 | 20 | |
ccc6cda3 JA |
21 | #include "config.h" |
22 | ||
726f6388 | 23 | #include "bashtypes.h" |
ac50fbac | 24 | #if defined (HAVE_SYS_PARAM_H) |
cce855bc JA |
25 | # include <sys/param.h> |
26 | #endif | |
ccc6cda3 JA |
27 | #include "posixstat.h" |
28 | ||
29 | #if defined (HAVE_UNISTD_H) | |
30 | # include <unistd.h> | |
31 | #endif | |
32 | ||
726f6388 JA |
33 | #include "filecntl.h" |
34 | #include "bashansi.h" | |
ccc6cda3 | 35 | #include <stdio.h> |
f73dda09 | 36 | #include "chartypes.h" |
ccc6cda3 JA |
37 | #include <errno.h> |
38 | ||
b80f6443 JA |
39 | #include "bashintl.h" |
40 | ||
726f6388 | 41 | #include "shell.h" |
d233b485 CR |
42 | #include "parser.h" |
43 | #include "flags.h" | |
44 | #include "findcmd.h" | |
95732b49 | 45 | #include "test.h" |
ac50fbac | 46 | #include "trap.h" |
95732b49 | 47 | |
d233b485 CR |
48 | #include "builtins/common.h" |
49 | ||
a0c0a00f CR |
50 | #if defined (HAVE_MBSTR_H) && defined (HAVE_MBSCHR) |
51 | # include <mbstr.h> /* mbschr */ | |
52 | #endif | |
53 | ||
726f6388 JA |
54 | #include <tilde/tilde.h> |
55 | ||
726f6388 JA |
56 | #if !defined (errno) |
57 | extern int errno; | |
58 | #endif /* !errno */ | |
59 | ||
d233b485 CR |
60 | #ifdef __CYGWIN__ |
61 | # include <sys/cygwin.h> | |
62 | #endif | |
cce855bc | 63 | |
7117c2d2 JA |
64 | static char *bash_special_tilde_expansions __P((char *)); |
65 | static int unquoted_tilde_word __P((const char *)); | |
66 | static void initialize_group_array __P((void)); | |
67 | ||
cce855bc | 68 | /* A standard error message to use when getcwd() returns NULL. */ |
3185942a | 69 | const char * const bash_getcwd_errstr = N_("getcwd: cannot access parent directories"); |
726f6388 | 70 | |
d233b485 CR |
71 | /* Do whatever is necessary to initialize `Posix mode'. This currently |
72 | modifies the following variables which are controlled via shopt: | |
73 | interactive_comments | |
74 | source_uses_path | |
75 | expand_aliases | |
76 | inherit_errexit | |
77 | print_shift_error | |
78 | ||
79 | and the following variables which cannot be user-modified: | |
80 | ||
81 | source_searches_cwd | |
82 | ||
83 | If we add to the first list, we need to change the table and functions | |
84 | below */ | |
85 | ||
86 | static struct { | |
87 | int *posix_mode_var; | |
88 | } posix_vars[] = | |
89 | { | |
90 | &interactive_comments, | |
91 | &source_uses_path, | |
92 | &expand_aliases, | |
93 | &inherit_errexit, | |
94 | &print_shift_error, | |
95 | 0 | |
96 | }; | |
97 | ||
726f6388 | 98 | void |
ccc6cda3 JA |
99 | posix_initialize (on) |
100 | int on; | |
726f6388 | 101 | { |
28ef6c31 JA |
102 | /* Things that should be turned on when posix mode is enabled. */ |
103 | if (on != 0) | |
104 | { | |
105 | interactive_comments = source_uses_path = expand_aliases = 1; | |
a0c0a00f | 106 | inherit_errexit = 1; |
3185942a | 107 | source_searches_cwd = 0; |
d233b485 CR |
108 | print_shift_error = 1; |
109 | ||
28ef6c31 JA |
110 | } |
111 | ||
112 | /* Things that should be turned on when posix mode is disabled. */ | |
113 | if (on == 0) | |
114 | { | |
115 | source_searches_cwd = 1; | |
116 | expand_aliases = interactive_shell; | |
d233b485 | 117 | print_shift_error = 0; |
28ef6c31 | 118 | } |
726f6388 JA |
119 | } |
120 | ||
d233b485 CR |
121 | int |
122 | num_posix_options () | |
123 | { | |
124 | return ((sizeof (posix_vars) / sizeof (posix_vars[0])) - 1); | |
125 | } | |
126 | ||
127 | char * | |
128 | get_posix_options (bitmap) | |
129 | char *bitmap; | |
130 | { | |
131 | register int i; | |
132 | ||
133 | if (bitmap == 0) | |
134 | bitmap = (char *)xmalloc (num_posix_options ()); /* no trailing NULL */ | |
135 | for (i = 0; posix_vars[i].posix_mode_var; i++) | |
136 | bitmap[i] = *(posix_vars[i].posix_mode_var); | |
137 | return bitmap; | |
138 | } | |
139 | ||
140 | void | |
141 | set_posix_options (bitmap) | |
142 | const char *bitmap; | |
143 | { | |
144 | register int i; | |
145 | ||
146 | for (i = 0; posix_vars[i].posix_mode_var; i++) | |
147 | *(posix_vars[i].posix_mode_var) = bitmap[i]; | |
148 | } | |
149 | ||
ccc6cda3 JA |
150 | /* **************************************************************** */ |
151 | /* */ | |
152 | /* Functions to convert to and from and display non-standard types */ | |
153 | /* */ | |
154 | /* **************************************************************** */ | |
155 | ||
726f6388 JA |
156 | #if defined (RLIMTYPE) |
157 | RLIMTYPE | |
158 | string_to_rlimtype (s) | |
159 | char *s; | |
160 | { | |
cce855bc JA |
161 | RLIMTYPE ret; |
162 | int neg; | |
726f6388 | 163 | |
cce855bc JA |
164 | ret = 0; |
165 | neg = 0; | |
726f6388 JA |
166 | while (s && *s && whitespace (*s)) |
167 | s++; | |
0001803f | 168 | if (s && (*s == '-' || *s == '+')) |
726f6388 JA |
169 | { |
170 | neg = *s == '-'; | |
171 | s++; | |
172 | } | |
f73dda09 JA |
173 | for ( ; s && *s && DIGIT (*s); s++) |
174 | ret = (ret * 10) + TODIGIT (*s); | |
726f6388 JA |
175 | return (neg ? -ret : ret); |
176 | } | |
177 | ||
178 | void | |
179 | print_rlimtype (n, addnl) | |
180 | RLIMTYPE n; | |
181 | int addnl; | |
182 | { | |
f73dda09 | 183 | char s[INT_STRLEN_BOUND (RLIMTYPE) + 1], *p; |
726f6388 | 184 | |
f73dda09 JA |
185 | p = s + sizeof(s); |
186 | *--p = '\0'; | |
726f6388 JA |
187 | |
188 | if (n < 0) | |
189 | { | |
f73dda09 JA |
190 | do |
191 | *--p = '0' - n % 10; | |
192 | while ((n /= 10) != 0); | |
193 | ||
194 | *--p = '-'; | |
195 | } | |
196 | else | |
197 | { | |
198 | do | |
199 | *--p = '0' + n % 10; | |
200 | while ((n /= 10) != 0); | |
726f6388 JA |
201 | } |
202 | ||
f73dda09 | 203 | printf ("%s%s", p, addnl ? "\n" : ""); |
726f6388 JA |
204 | } |
205 | #endif /* RLIMTYPE */ | |
206 | ||
ccc6cda3 JA |
207 | /* **************************************************************** */ |
208 | /* */ | |
209 | /* Input Validation Functions */ | |
210 | /* */ | |
211 | /* **************************************************************** */ | |
212 | ||
213 | /* Return non-zero if all of the characters in STRING are digits. */ | |
214 | int | |
215 | all_digits (string) | |
a0c0a00f | 216 | const char *string; |
ccc6cda3 | 217 | { |
a0c0a00f | 218 | register const char *s; |
28ef6c31 JA |
219 | |
220 | for (s = string; *s; s++) | |
f73dda09 | 221 | if (DIGIT (*s) == 0) |
28ef6c31 JA |
222 | return (0); |
223 | ||
ccc6cda3 JA |
224 | return (1); |
225 | } | |
226 | ||
227 | /* Return non-zero if the characters pointed to by STRING constitute a | |
228 | valid number. Stuff the converted number into RESULT if RESULT is | |
f73dda09 | 229 | not null. */ |
ccc6cda3 JA |
230 | int |
231 | legal_number (string, result) | |
3185942a | 232 | const char *string; |
7117c2d2 | 233 | intmax_t *result; |
ccc6cda3 | 234 | { |
7117c2d2 | 235 | intmax_t value; |
cce855bc | 236 | char *ep; |
ccc6cda3 JA |
237 | |
238 | if (result) | |
239 | *result = 0; | |
240 | ||
ac50fbac CR |
241 | if (string == 0) |
242 | return 0; | |
243 | ||
f73dda09 | 244 | errno = 0; |
7117c2d2 | 245 | value = strtoimax (string, &ep, 10); |
3185942a | 246 | if (errno || ep == string) |
f73dda09 | 247 | return 0; /* errno is set on overflow or underflow */ |
ccc6cda3 | 248 | |
7117c2d2 | 249 | /* Skip any trailing whitespace, since strtoimax does not. */ |
28ef6c31 JA |
250 | while (whitespace (*ep)) |
251 | ep++; | |
252 | ||
cce855bc JA |
253 | /* If *string is not '\0' but *ep is '\0' on return, the entire string |
254 | is valid. */ | |
ac50fbac | 255 | if (*string && *ep == '\0') |
ccc6cda3 JA |
256 | { |
257 | if (result) | |
cce855bc JA |
258 | *result = value; |
259 | /* The SunOS4 implementation of strtol() will happily ignore | |
260 | overflow conditions, so this cannot do overflow correctly | |
261 | on those systems. */ | |
262 | return 1; | |
ccc6cda3 | 263 | } |
cce855bc JA |
264 | |
265 | return (0); | |
ccc6cda3 JA |
266 | } |
267 | ||
726f6388 JA |
268 | /* Return 1 if this token is a legal shell `identifier'; that is, it consists |
269 | solely of letters, digits, and underscores, and does not begin with a | |
270 | digit. */ | |
271 | int | |
272 | legal_identifier (name) | |
a0c0a00f | 273 | const char *name; |
726f6388 | 274 | { |
a0c0a00f | 275 | register const char *s; |
f73dda09 | 276 | unsigned char c; |
726f6388 | 277 | |
f73dda09 | 278 | if (!name || !(c = *name) || (legal_variable_starter (c) == 0)) |
726f6388 JA |
279 | return (0); |
280 | ||
f73dda09 | 281 | for (s = name + 1; (c = *s) != 0; s++) |
726f6388 | 282 | { |
f73dda09 | 283 | if (legal_variable_char (c) == 0) |
28ef6c31 | 284 | return (0); |
726f6388 JA |
285 | } |
286 | return (1); | |
287 | } | |
288 | ||
a0c0a00f CR |
289 | /* Return 1 if NAME is a valid value that can be assigned to a nameref |
290 | variable. FLAGS can be 2, in which case the name is going to be used | |
291 | to create a variable. Other values are currently unused, but could | |
292 | be used to allow values to be stored and indirectly referenced, but | |
293 | not used in assignments. */ | |
294 | int | |
295 | valid_nameref_value (name, flags) | |
296 | const char *name; | |
297 | int flags; | |
298 | { | |
299 | if (name == 0 || *name == 0) | |
300 | return 0; | |
301 | ||
302 | /* valid identifier */ | |
303 | #if defined (ARRAY_VARS) | |
304 | if (legal_identifier (name) || (flags != 2 && valid_array_reference (name, 0))) | |
305 | #else | |
306 | if (legal_identifier (name)) | |
307 | #endif | |
308 | return 1; | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | int | |
314 | check_selfref (name, value, flags) | |
315 | const char *name; | |
316 | char *value; | |
317 | int flags; | |
318 | { | |
319 | char *t; | |
320 | ||
321 | if (STREQ (name, value)) | |
322 | return 1; | |
323 | ||
324 | #if defined (ARRAY_VARS) | |
325 | if (valid_array_reference (value, 0)) | |
326 | { | |
d233b485 | 327 | t = array_variable_name (value, 0, (char **)NULL, (int *)NULL); |
a0c0a00f CR |
328 | if (t && STREQ (name, t)) |
329 | { | |
330 | free (t); | |
331 | return 1; | |
332 | } | |
333 | free (t); | |
334 | } | |
335 | #endif | |
336 | ||
337 | return 0; /* not a self reference */ | |
338 | } | |
339 | ||
726f6388 JA |
340 | /* Make sure that WORD is a valid shell identifier, i.e. |
341 | does not contain a dollar sign, nor is quoted in any way. Nor | |
342 | does it consist of all digits. If CHECK_WORD is non-zero, | |
343 | the word is checked to ensure that it consists of only letters, | |
344 | digits, and underscores. */ | |
ccc6cda3 | 345 | int |
726f6388 JA |
346 | check_identifier (word, check_word) |
347 | WORD_DESC *word; | |
348 | int check_word; | |
349 | { | |
ccc6cda3 | 350 | if ((word->flags & (W_HASDOLLAR|W_QUOTED)) || all_digits (word->word)) |
726f6388 | 351 | { |
b80f6443 | 352 | internal_error (_("`%s': not a valid identifier"), word->word); |
726f6388 JA |
353 | return (0); |
354 | } | |
355 | else if (check_word && legal_identifier (word->word) == 0) | |
356 | { | |
b80f6443 | 357 | internal_error (_("`%s': not a valid identifier"), word->word); |
726f6388 JA |
358 | return (0); |
359 | } | |
360 | else | |
361 | return (1); | |
362 | } | |
363 | ||
a0c0a00f CR |
364 | /* Return 1 if STRING is a function name that the shell will import from |
365 | the environment. Currently we reject attempts to import shell functions | |
366 | containing slashes, beginning with newlines or containing blanks. In | |
367 | Posix mode, we require that STRING be a valid shell identifier. Not | |
368 | used yet. */ | |
369 | int | |
370 | importable_function_name (string, len) | |
371 | const char *string; | |
372 | size_t len; | |
373 | { | |
374 | if (absolute_program (string)) /* don't allow slash */ | |
375 | return 0; | |
376 | if (*string == '\n') /* can't start with a newline */ | |
377 | return 0; | |
378 | if (shellblank (*string) || shellblank(string[len-1])) | |
379 | return 0; | |
380 | return (posixly_correct ? legal_identifier (string) : 1); | |
381 | } | |
382 | ||
383 | int | |
384 | exportable_function_name (string) | |
385 | const char *string; | |
386 | { | |
387 | if (absolute_program (string)) | |
388 | return 0; | |
389 | if (mbschr (string, '=') != 0) | |
390 | return 0; | |
391 | return 1; | |
392 | } | |
393 | ||
b80f6443 JA |
394 | /* Return 1 if STRING comprises a valid alias name. The shell accepts |
395 | essentially all characters except those which must be quoted to the | |
396 | parser (which disqualifies them from alias expansion anyway) and `/'. */ | |
397 | int | |
398 | legal_alias_name (string, flags) | |
a0c0a00f | 399 | const char *string; |
b80f6443 JA |
400 | int flags; |
401 | { | |
a0c0a00f | 402 | register const char *s; |
b80f6443 JA |
403 | |
404 | for (s = string; *s; s++) | |
405 | if (shellbreak (*s) || shellxquote (*s) || shellexp (*s) || (*s == '/')) | |
406 | return 0; | |
407 | return 1; | |
408 | } | |
409 | ||
7117c2d2 | 410 | /* Returns non-zero if STRING is an assignment statement. The returned value |
d233b485 CR |
411 | is the index of the `=' sign. If FLAGS&1 we are expecting a compound assignment |
412 | and don't want an array subscript before the `='. */ | |
7117c2d2 | 413 | int |
b80f6443 | 414 | assignment (string, flags) |
7117c2d2 | 415 | const char *string; |
b80f6443 | 416 | int flags; |
7117c2d2 JA |
417 | { |
418 | register unsigned char c; | |
419 | register int newi, indx; | |
420 | ||
421 | c = string[indx = 0]; | |
422 | ||
b80f6443 | 423 | #if defined (ARRAY_VARS) |
d233b485 | 424 | if ((legal_variable_starter (c) == 0) && ((flags&1) == 0 || c != '[')) /* ] */ |
b80f6443 | 425 | #else |
7117c2d2 | 426 | if (legal_variable_starter (c) == 0) |
b80f6443 | 427 | #endif |
7117c2d2 JA |
428 | return (0); |
429 | ||
430 | while (c = string[indx]) | |
431 | { | |
432 | /* The following is safe. Note that '=' at the start of a word | |
433 | is not an assignment statement. */ | |
434 | if (c == '=') | |
435 | return (indx); | |
436 | ||
437 | #if defined (ARRAY_VARS) | |
438 | if (c == '[') | |
439 | { | |
d233b485 CR |
440 | newi = skipsubscript (string, indx, (flags & 2) ? 1 : 0); |
441 | /* XXX - why not check for blank subscripts here, if we do in | |
442 | valid_array_reference? */ | |
7117c2d2 JA |
443 | if (string[newi++] != ']') |
444 | return (0); | |
95732b49 JA |
445 | if (string[newi] == '+' && string[newi+1] == '=') |
446 | return (newi + 1); | |
7117c2d2 JA |
447 | return ((string[newi] == '=') ? newi : 0); |
448 | } | |
449 | #endif /* ARRAY_VARS */ | |
450 | ||
95732b49 JA |
451 | /* Check for `+=' */ |
452 | if (c == '+' && string[indx+1] == '=') | |
453 | return (indx + 1); | |
454 | ||
7117c2d2 JA |
455 | /* Variable names in assignment statements may contain only letters, |
456 | digits, and `_'. */ | |
457 | if (legal_variable_char (c) == 0) | |
458 | return (0); | |
459 | ||
460 | indx++; | |
461 | } | |
462 | return (0); | |
463 | } | |
464 | ||
d233b485 CR |
465 | int |
466 | line_isblank (line) | |
467 | const char *line; | |
468 | { | |
469 | register int i; | |
470 | ||
471 | if (line == 0) | |
472 | return 0; /* XXX */ | |
473 | for (i = 0; line[i]; i++) | |
474 | if (isblank ((unsigned char)line[i]) == 0) | |
475 | break; | |
476 | return (line[i] == '\0'); | |
477 | } | |
478 | ||
ccc6cda3 JA |
479 | /* **************************************************************** */ |
480 | /* */ | |
481 | /* Functions to manage files and file descriptors */ | |
482 | /* */ | |
483 | /* **************************************************************** */ | |
484 | ||
726f6388 JA |
485 | /* A function to unset no-delay mode on a file descriptor. Used in shell.c |
486 | to unset it on the fd passed as stdin. Should be called on stdin if | |
487 | readline gets an EAGAIN or EWOULDBLOCK when trying to read input. */ | |
488 | ||
489 | #if !defined (O_NDELAY) | |
490 | # if defined (FNDELAY) | |
491 | # define O_NDELAY FNDELAY | |
492 | # endif | |
493 | #endif /* O_NDELAY */ | |
494 | ||
495 | /* Make sure no-delay mode is not set on file descriptor FD. */ | |
bb70624e | 496 | int |
28ef6c31 | 497 | sh_unset_nodelay_mode (fd) |
726f6388 JA |
498 | int fd; |
499 | { | |
bb70624e | 500 | int flags, bflags; |
726f6388 JA |
501 | |
502 | if ((flags = fcntl (fd, F_GETFL, 0)) < 0) | |
bb70624e | 503 | return -1; |
726f6388 | 504 | |
bb70624e | 505 | bflags = 0; |
ccc6cda3 JA |
506 | |
507 | /* This is defined to O_NDELAY in filecntl.h if O_NONBLOCK is not present | |
508 | and O_NDELAY is defined. */ | |
bb70624e JA |
509 | #ifdef O_NONBLOCK |
510 | bflags |= O_NONBLOCK; | |
511 | #endif | |
512 | ||
513 | #ifdef O_NDELAY | |
514 | bflags |= O_NDELAY; | |
515 | #endif | |
516 | ||
517 | if (flags & bflags) | |
726f6388 | 518 | { |
bb70624e JA |
519 | flags &= ~bflags; |
520 | return (fcntl (fd, F_SETFL, flags)); | |
726f6388 | 521 | } |
726f6388 | 522 | |
bb70624e | 523 | return 0; |
726f6388 JA |
524 | } |
525 | ||
d233b485 CR |
526 | /* Just a wrapper for the define in include/filecntl.h */ |
527 | int | |
528 | sh_setclexec (fd) | |
529 | int fd; | |
530 | { | |
531 | return (SET_CLOSE_ON_EXEC (fd)); | |
532 | } | |
533 | ||
7117c2d2 JA |
534 | /* Return 1 if file descriptor FD is valid; 0 otherwise. */ |
535 | int | |
536 | sh_validfd (fd) | |
537 | int fd; | |
538 | { | |
539 | return (fcntl (fd, F_GETFD, 0) >= 0); | |
540 | } | |
541 | ||
495aee44 CR |
542 | int |
543 | fd_ispipe (fd) | |
544 | int fd; | |
545 | { | |
546 | errno = 0; | |
a0c0a00f | 547 | return ((lseek (fd, 0L, SEEK_CUR) < 0) && (errno == ESPIPE)); |
495aee44 CR |
548 | } |
549 | ||
b72432fd JA |
550 | /* There is a bug in the NeXT 2.1 rlogind that causes opens |
551 | of /dev/tty to fail. */ | |
552 | ||
553 | #if defined (__BEOS__) | |
554 | /* On BeOS, opening in non-blocking mode exposes a bug in BeOS, so turn it | |
555 | into a no-op. This should probably go away in the future. */ | |
556 | # undef O_NONBLOCK | |
557 | # define O_NONBLOCK 0 | |
558 | #endif /* __BEOS__ */ | |
559 | ||
726f6388 | 560 | void |
ccc6cda3 | 561 | check_dev_tty () |
726f6388 | 562 | { |
ccc6cda3 JA |
563 | int tty_fd; |
564 | char *tty; | |
726f6388 | 565 | |
d166f048 | 566 | tty_fd = open ("/dev/tty", O_RDWR|O_NONBLOCK); |
726f6388 | 567 | |
ccc6cda3 | 568 | if (tty_fd < 0) |
726f6388 | 569 | { |
ccc6cda3 JA |
570 | tty = (char *)ttyname (fileno (stdin)); |
571 | if (tty == 0) | |
572 | return; | |
d166f048 | 573 | tty_fd = open (tty, O_RDWR|O_NONBLOCK); |
726f6388 | 574 | } |
ac50fbac CR |
575 | if (tty_fd >= 0) |
576 | close (tty_fd); | |
726f6388 JA |
577 | } |
578 | ||
ccc6cda3 JA |
579 | /* Return 1 if PATH1 and PATH2 are the same file. This is kind of |
580 | expensive. If non-NULL STP1 and STP2 point to stat structures | |
581 | corresponding to PATH1 and PATH2, respectively. */ | |
726f6388 | 582 | int |
ccc6cda3 | 583 | same_file (path1, path2, stp1, stp2) |
a0c0a00f | 584 | const char *path1, *path2; |
ccc6cda3 | 585 | struct stat *stp1, *stp2; |
726f6388 | 586 | { |
ccc6cda3 | 587 | struct stat st1, st2; |
726f6388 | 588 | |
ccc6cda3 | 589 | if (stp1 == NULL) |
726f6388 | 590 | { |
ccc6cda3 JA |
591 | if (stat (path1, &st1) != 0) |
592 | return (0); | |
593 | stp1 = &st1; | |
726f6388 | 594 | } |
726f6388 | 595 | |
ccc6cda3 JA |
596 | if (stp2 == NULL) |
597 | { | |
598 | if (stat (path2, &st2) != 0) | |
599 | return (0); | |
600 | stp2 = &st2; | |
601 | } | |
726f6388 | 602 | |
ccc6cda3 | 603 | return ((stp1->st_dev == stp2->st_dev) && (stp1->st_ino == stp2->st_ino)); |
726f6388 JA |
604 | } |
605 | ||
ccc6cda3 JA |
606 | /* Move FD to a number close to the maximum number of file descriptors |
607 | allowed in the shell process, to avoid the user stepping on it with | |
608 | redirection and causing us extra work. If CHECK_NEW is non-zero, | |
609 | we check whether or not the file descriptors are in use before | |
d166f048 JA |
610 | duplicating FD onto them. MAXFD says where to start checking the |
611 | file descriptors. If it's less than 20, we get the maximum value | |
612 | available from getdtablesize(2). */ | |
726f6388 | 613 | int |
d166f048 JA |
614 | move_to_high_fd (fd, check_new, maxfd) |
615 | int fd, check_new, maxfd; | |
726f6388 | 616 | { |
ccc6cda3 | 617 | int script_fd, nfds, ignore; |
726f6388 | 618 | |
d166f048 JA |
619 | if (maxfd < 20) |
620 | { | |
621 | nfds = getdtablesize (); | |
622 | if (nfds <= 0) | |
623 | nfds = 20; | |
7117c2d2 JA |
624 | if (nfds > HIGH_FD_MAX) |
625 | nfds = HIGH_FD_MAX; /* reasonable maximum */ | |
d166f048 JA |
626 | } |
627 | else | |
628 | nfds = maxfd; | |
726f6388 | 629 | |
ccc6cda3 JA |
630 | for (nfds--; check_new && nfds > 3; nfds--) |
631 | if (fcntl (nfds, F_GETFD, &ignore) == -1) | |
632 | break; | |
726f6388 | 633 | |
7117c2d2 | 634 | if (nfds > 3 && fd != nfds && (script_fd = dup2 (fd, nfds)) != -1) |
ccc6cda3 JA |
635 | { |
636 | if (check_new == 0 || fd != fileno (stderr)) /* don't close stderr */ | |
637 | close (fd); | |
638 | return (script_fd); | |
639 | } | |
726f6388 | 640 | |
7117c2d2 JA |
641 | /* OK, we didn't find one less than our artificial maximum; return the |
642 | original file descriptor. */ | |
ccc6cda3 JA |
643 | return (fd); |
644 | } | |
645 | ||
646 | /* Return non-zero if the characters from SAMPLE are not all valid | |
647 | characters to be found in the first line of a shell script. We | |
648 | check up to the first newline, or SAMPLE_LEN, whichever comes first. | |
649 | All of the characters must be printable or whitespace. */ | |
726f6388 | 650 | |
726f6388 | 651 | int |
ccc6cda3 | 652 | check_binary_file (sample, sample_len) |
a0c0a00f | 653 | const char *sample; |
ccc6cda3 | 654 | int sample_len; |
726f6388 | 655 | { |
ccc6cda3 | 656 | register int i; |
f73dda09 | 657 | unsigned char c; |
726f6388 | 658 | |
ccc6cda3 JA |
659 | for (i = 0; i < sample_len; i++) |
660 | { | |
f73dda09 JA |
661 | c = sample[i]; |
662 | if (c == '\n') | |
ccc6cda3 | 663 | return (0); |
0628567a | 664 | if (c == '\0') |
ccc6cda3 JA |
665 | return (1); |
666 | } | |
726f6388 | 667 | |
ccc6cda3 | 668 | return (0); |
726f6388 JA |
669 | } |
670 | ||
3185942a JA |
671 | /* **************************************************************** */ |
672 | /* */ | |
673 | /* Functions to manipulate pipes */ | |
674 | /* */ | |
675 | /* **************************************************************** */ | |
676 | ||
677 | int | |
678 | sh_openpipe (pv) | |
679 | int *pv; | |
680 | { | |
681 | int r; | |
682 | ||
683 | if ((r = pipe (pv)) < 0) | |
684 | return r; | |
685 | ||
686 | pv[0] = move_to_high_fd (pv[0], 1, 64); | |
687 | pv[1] = move_to_high_fd (pv[1], 1, 64); | |
688 | ||
689 | return 0; | |
690 | } | |
691 | ||
692 | int | |
693 | sh_closepipe (pv) | |
694 | int *pv; | |
695 | { | |
696 | if (pv[0] >= 0) | |
697 | close (pv[0]); | |
698 | ||
699 | if (pv[1] >= 0) | |
700 | close (pv[1]); | |
701 | ||
702 | pv[0] = pv[1] = -1; | |
703 | return 0; | |
704 | } | |
705 | ||
b80f6443 JA |
706 | /* **************************************************************** */ |
707 | /* */ | |
708 | /* Functions to inspect pathnames */ | |
709 | /* */ | |
710 | /* **************************************************************** */ | |
711 | ||
3185942a JA |
712 | int |
713 | file_exists (fn) | |
a0c0a00f | 714 | const char *fn; |
3185942a JA |
715 | { |
716 | struct stat sb; | |
717 | ||
718 | return (stat (fn, &sb) == 0); | |
719 | } | |
720 | ||
b80f6443 JA |
721 | int |
722 | file_isdir (fn) | |
a0c0a00f | 723 | const char *fn; |
b80f6443 JA |
724 | { |
725 | struct stat sb; | |
726 | ||
727 | return ((stat (fn, &sb) == 0) && S_ISDIR (sb.st_mode)); | |
728 | } | |
729 | ||
730 | int | |
731 | file_iswdir (fn) | |
a0c0a00f | 732 | const char *fn; |
b80f6443 | 733 | { |
0628567a | 734 | return (file_isdir (fn) && sh_eaccess (fn, W_OK) == 0); |
b80f6443 JA |
735 | } |
736 | ||
495aee44 CR |
737 | /* Return 1 if STRING is "." or "..", optionally followed by a directory |
738 | separator */ | |
739 | int | |
ac50fbac | 740 | path_dot_or_dotdot (string) |
495aee44 CR |
741 | const char *string; |
742 | { | |
743 | if (string == 0 || *string == '\0' || *string != '.') | |
744 | return (0); | |
745 | ||
746 | /* string[0] == '.' */ | |
747 | if (PATHSEP(string[1]) || (string[1] == '.' && PATHSEP(string[2]))) | |
748 | return (1); | |
749 | ||
750 | return (0); | |
751 | } | |
752 | ||
95732b49 JA |
753 | /* Return 1 if STRING contains an absolute pathname, else 0. Used by `cd' |
754 | to decide whether or not to look up a directory name in $CDPATH. */ | |
755 | int | |
756 | absolute_pathname (string) | |
757 | const char *string; | |
758 | { | |
759 | if (string == 0 || *string == '\0') | |
760 | return (0); | |
761 | ||
762 | if (ABSPATH(string)) | |
763 | return (1); | |
764 | ||
765 | if (string[0] == '.' && PATHSEP(string[1])) /* . and ./ */ | |
766 | return (1); | |
767 | ||
768 | if (string[0] == '.' && string[1] == '.' && PATHSEP(string[2])) /* .. and ../ */ | |
769 | return (1); | |
770 | ||
771 | return (0); | |
772 | } | |
773 | ||
774 | /* Return 1 if STRING is an absolute program name; it is absolute if it | |
775 | contains any slashes. This is used to decide whether or not to look | |
776 | up through $PATH. */ | |
777 | int | |
778 | absolute_program (string) | |
779 | const char *string; | |
780 | { | |
0001803f | 781 | return ((char *)mbschr (string, '/') != (char *)NULL); |
95732b49 | 782 | } |
b80f6443 | 783 | |
ccc6cda3 JA |
784 | /* **************************************************************** */ |
785 | /* */ | |
786 | /* Functions to manipulate pathnames */ | |
787 | /* */ | |
788 | /* **************************************************************** */ | |
726f6388 | 789 | |
726f6388 JA |
790 | /* Turn STRING (a pathname) into an absolute pathname, assuming that |
791 | DOT_PATH contains the symbolic location of `.'. This always | |
792 | returns a new string, even if STRING was an absolute pathname to | |
793 | begin with. */ | |
794 | char * | |
795 | make_absolute (string, dot_path) | |
a0c0a00f | 796 | const char *string, *dot_path; |
726f6388 JA |
797 | { |
798 | char *result; | |
ccc6cda3 | 799 | |
28ef6c31 | 800 | if (dot_path == 0 || ABSPATH(string)) |
b80f6443 JA |
801 | #ifdef __CYGWIN__ |
802 | { | |
803 | char pathbuf[PATH_MAX + 1]; | |
804 | ||
d233b485 CR |
805 | /* WAS cygwin_conv_to_full_posix_path (string, pathbuf); */ |
806 | cygwin_conv_path (CCP_WIN_A_TO_POSIX, string, pathbuf, PATH_MAX); | |
b80f6443 JA |
807 | result = savestring (pathbuf); |
808 | } | |
809 | #else | |
726f6388 | 810 | result = savestring (string); |
b80f6443 | 811 | #endif |
726f6388 | 812 | else |
bb70624e | 813 | result = sh_makepath (dot_path, string, 0); |
726f6388 JA |
814 | |
815 | return (result); | |
816 | } | |
817 | ||
726f6388 | 818 | /* Return the `basename' of the pathname in STRING (the stuff after the |
95732b49 | 819 | last '/'). If STRING is `/', just return it. */ |
726f6388 JA |
820 | char * |
821 | base_pathname (string) | |
822 | char *string; | |
823 | { | |
824 | char *p; | |
825 | ||
95732b49 | 826 | #if 0 |
28ef6c31 | 827 | if (absolute_pathname (string) == 0) |
726f6388 | 828 | return (string); |
95732b49 JA |
829 | #endif |
830 | ||
831 | if (string[0] == '/' && string[1] == 0) | |
832 | return (string); | |
726f6388 JA |
833 | |
834 | p = (char *)strrchr (string, '/'); | |
ccc6cda3 | 835 | return (p ? ++p : string); |
726f6388 JA |
836 | } |
837 | ||
838 | /* Return the full pathname of FILE. Easy. Filenames that begin | |
839 | with a '/' are returned as themselves. Other filenames have | |
840 | the current working directory prepended. A new string is | |
841 | returned in either case. */ | |
842 | char * | |
843 | full_pathname (file) | |
844 | char *file; | |
845 | { | |
bb70624e | 846 | char *ret; |
726f6388 | 847 | |
7117c2d2 | 848 | file = (*file == '~') ? bash_tilde_expand (file, 0) : savestring (file); |
726f6388 | 849 | |
28ef6c31 | 850 | if (ABSPATH(file)) |
726f6388 JA |
851 | return (file); |
852 | ||
bb70624e JA |
853 | ret = sh_makepath ((char *)NULL, file, (MP_DOCWD|MP_RMDOT)); |
854 | free (file); | |
726f6388 | 855 | |
bb70624e | 856 | return (ret); |
726f6388 | 857 | } |
726f6388 JA |
858 | |
859 | /* A slightly related function. Get the prettiest name of this | |
860 | directory possible. */ | |
ccc6cda3 | 861 | static char tdir[PATH_MAX]; |
726f6388 JA |
862 | |
863 | /* Return a pretty pathname. If the first part of the pathname is | |
864 | the same as $HOME, then replace that with `~'. */ | |
865 | char * | |
866 | polite_directory_format (name) | |
867 | char *name; | |
868 | { | |
ccc6cda3 JA |
869 | char *home; |
870 | int l; | |
726f6388 | 871 | |
ccc6cda3 JA |
872 | home = get_string_value ("HOME"); |
873 | l = home ? strlen (home) : 0; | |
726f6388 JA |
874 | if (l > 1 && strncmp (home, name, l) == 0 && (!name[l] || name[l] == '/')) |
875 | { | |
e8ce775d | 876 | strncpy (tdir + 1, name + l, sizeof(tdir) - 2); |
726f6388 | 877 | tdir[0] = '~'; |
e8ce775d | 878 | tdir[sizeof(tdir) - 1] = '\0'; |
726f6388 JA |
879 | return (tdir); |
880 | } | |
881 | else | |
882 | return (name); | |
883 | } | |
884 | ||
3185942a JA |
885 | /* Trim NAME. If NAME begins with `~/', skip over tilde prefix. Trim to |
886 | keep any tilde prefix and PROMPT_DIRTRIM trailing directory components | |
887 | and replace the intervening characters with `...' */ | |
888 | char * | |
889 | trim_pathname (name, maxlen) | |
890 | char *name; | |
891 | int maxlen; | |
892 | { | |
893 | int nlen, ndirs; | |
894 | intmax_t nskip; | |
895 | char *nbeg, *nend, *ntail, *v; | |
896 | ||
897 | if (name == 0 || (nlen = strlen (name)) == 0) | |
898 | return name; | |
899 | nend = name + nlen; | |
900 | ||
901 | v = get_string_value ("PROMPT_DIRTRIM"); | |
902 | if (v == 0 || *v == 0) | |
903 | return name; | |
904 | if (legal_number (v, &nskip) == 0 || nskip <= 0) | |
905 | return name; | |
906 | ||
907 | /* Skip over tilde prefix */ | |
908 | nbeg = name; | |
909 | if (name[0] == '~') | |
910 | for (nbeg = name; *nbeg; nbeg++) | |
911 | if (*nbeg == '/') | |
912 | { | |
913 | nbeg++; | |
914 | break; | |
915 | } | |
916 | if (*nbeg == 0) | |
917 | return name; | |
918 | ||
919 | for (ndirs = 0, ntail = nbeg; *ntail; ntail++) | |
920 | if (*ntail == '/') | |
921 | ndirs++; | |
0001803f | 922 | if (ndirs < nskip) |
3185942a JA |
923 | return name; |
924 | ||
925 | for (ntail = (*nend == '/') ? nend : nend - 1; ntail > nbeg; ntail--) | |
926 | { | |
927 | if (*ntail == '/') | |
928 | nskip--; | |
929 | if (nskip == 0) | |
930 | break; | |
931 | } | |
932 | if (ntail == nbeg) | |
933 | return name; | |
934 | ||
935 | /* Now we want to return name[0..nbeg]+"..."+ntail, modifying name in place */ | |
936 | nlen = ntail - nbeg; | |
937 | if (nlen <= 3) | |
938 | return name; | |
939 | ||
940 | *nbeg++ = '.'; | |
941 | *nbeg++ = '.'; | |
942 | *nbeg++ = '.'; | |
943 | ||
944 | nlen = nend - ntail; | |
ac50fbac | 945 | memmove (nbeg, ntail, nlen); |
3185942a JA |
946 | nbeg[nlen] = '\0'; |
947 | ||
948 | return name; | |
949 | } | |
950 | ||
a0c0a00f CR |
951 | /* Return a printable representation of FN without special characters. The |
952 | caller is responsible for freeing memory if this returns something other | |
953 | than its argument. If FLAGS is non-zero, we are printing for portable | |
954 | re-input and should single-quote filenames appropriately. */ | |
955 | char * | |
956 | printable_filename (fn, flags) | |
957 | char *fn; | |
958 | int flags; | |
959 | { | |
960 | char *newf; | |
961 | ||
962 | if (ansic_shouldquote (fn)) | |
963 | newf = ansic_quote (fn, 0, NULL); | |
964 | else if (flags && sh_contains_shell_metas (fn)) | |
965 | newf = sh_single_quote (fn); | |
966 | else | |
967 | newf = fn; | |
968 | ||
969 | return newf; | |
970 | } | |
971 | ||
ccc6cda3 JA |
972 | /* Given a string containing units of information separated by colons, |
973 | return the next one pointed to by (P_INDEX), or NULL if there are no more. | |
974 | Advance (P_INDEX) to the character after the colon. */ | |
975 | char * | |
976 | extract_colon_unit (string, p_index) | |
977 | char *string; | |
978 | int *p_index; | |
726f6388 | 979 | { |
ccc6cda3 JA |
980 | int i, start, len; |
981 | char *value; | |
726f6388 | 982 | |
ccc6cda3 JA |
983 | if (string == 0) |
984 | return (string); | |
726f6388 | 985 | |
ccc6cda3 JA |
986 | len = strlen (string); |
987 | if (*p_index >= len) | |
988 | return ((char *)NULL); | |
726f6388 | 989 | |
ccc6cda3 | 990 | i = *p_index; |
726f6388 | 991 | |
ccc6cda3 JA |
992 | /* Each call to this routine leaves the index pointing at a colon if |
993 | there is more to the path. If I is > 0, then increment past the | |
994 | `:'. If I is 0, then the path has a leading colon. Trailing colons | |
995 | are handled OK by the `else' part of the if statement; an empty | |
996 | string is returned in that case. */ | |
997 | if (i && string[i] == ':') | |
998 | i++; | |
999 | ||
1000 | for (start = i; string[i] && string[i] != ':'; i++) | |
1001 | ; | |
1002 | ||
1003 | *p_index = i; | |
1004 | ||
1005 | if (i == start) | |
1006 | { | |
1007 | if (string[i]) | |
1008 | (*p_index)++; | |
1009 | /* Return "" in the case of a trailing `:'. */ | |
f73dda09 | 1010 | value = (char *)xmalloc (1); |
ccc6cda3 JA |
1011 | value[0] = '\0'; |
1012 | } | |
1013 | else | |
bb70624e | 1014 | value = substring (string, start, i); |
ccc6cda3 JA |
1015 | |
1016 | return (value); | |
726f6388 | 1017 | } |
726f6388 JA |
1018 | |
1019 | /* **************************************************************** */ | |
1020 | /* */ | |
1021 | /* Tilde Initialization and Expansion */ | |
1022 | /* */ | |
1023 | /* **************************************************************** */ | |
1024 | ||
cce855bc JA |
1025 | #if defined (PUSHD_AND_POPD) |
1026 | extern char *get_dirstack_from_string __P((char *)); | |
1027 | #endif | |
1028 | ||
f73dda09 | 1029 | static char **bash_tilde_prefixes; |
95732b49 | 1030 | static char **bash_tilde_prefixes2; |
f73dda09 | 1031 | static char **bash_tilde_suffixes; |
95732b49 | 1032 | static char **bash_tilde_suffixes2; |
f73dda09 | 1033 | |
726f6388 JA |
1034 | /* If tilde_expand hasn't been able to expand the text, perhaps it |
1035 | is a special shell expansion. This function is installed as the | |
cce855bc JA |
1036 | tilde_expansion_preexpansion_hook. It knows how to expand ~- and ~+. |
1037 | If PUSHD_AND_POPD is defined, ~[+-]N expands to directories from the | |
1038 | directory stack. */ | |
726f6388 | 1039 | static char * |
d166f048 | 1040 | bash_special_tilde_expansions (text) |
726f6388 JA |
1041 | char *text; |
1042 | { | |
ccc6cda3 | 1043 | char *result; |
726f6388 | 1044 | |
ccc6cda3 | 1045 | result = (char *)NULL; |
cce855bc JA |
1046 | |
1047 | if (text[0] == '+' && text[1] == '\0') | |
1048 | result = get_string_value ("PWD"); | |
1049 | else if (text[0] == '-' && text[1] == '\0') | |
1050 | result = get_string_value ("OLDPWD"); | |
1051 | #if defined (PUSHD_AND_POPD) | |
f73dda09 | 1052 | else if (DIGIT (*text) || ((*text == '+' || *text == '-') && DIGIT (text[1]))) |
cce855bc JA |
1053 | result = get_dirstack_from_string (text); |
1054 | #endif | |
726f6388 | 1055 | |
ccc6cda3 | 1056 | return (result ? savestring (result) : (char *)NULL); |
726f6388 JA |
1057 | } |
1058 | ||
1059 | /* Initialize the tilde expander. In Bash, we handle `~-' and `~+', as | |
1060 | well as handling special tilde prefixes; `:~" and `=~' are indications | |
1061 | that we should do tilde expansion. */ | |
1062 | void | |
1063 | tilde_initialize () | |
1064 | { | |
1065 | static int times_called = 0; | |
1066 | ||
d166f048 | 1067 | /* Tell the tilde expander that we want a crack first. */ |
f73dda09 | 1068 | tilde_expansion_preexpansion_hook = bash_special_tilde_expansions; |
726f6388 JA |
1069 | |
1070 | /* Tell the tilde expander about special strings which start a tilde | |
1071 | expansion, and the special strings that end one. Only do this once. | |
1072 | tilde_initialize () is called from within bashline_reinitialize (). */ | |
cce855bc | 1073 | if (times_called++ == 0) |
726f6388 | 1074 | { |
7117c2d2 | 1075 | bash_tilde_prefixes = strvec_create (3); |
f73dda09 JA |
1076 | bash_tilde_prefixes[0] = "=~"; |
1077 | bash_tilde_prefixes[1] = ":~"; | |
1078 | bash_tilde_prefixes[2] = (char *)NULL; | |
1079 | ||
95732b49 JA |
1080 | bash_tilde_prefixes2 = strvec_create (2); |
1081 | bash_tilde_prefixes2[0] = ":~"; | |
1082 | bash_tilde_prefixes2[1] = (char *)NULL; | |
1083 | ||
f73dda09 JA |
1084 | tilde_additional_prefixes = bash_tilde_prefixes; |
1085 | ||
7117c2d2 | 1086 | bash_tilde_suffixes = strvec_create (3); |
f73dda09 JA |
1087 | bash_tilde_suffixes[0] = ":"; |
1088 | bash_tilde_suffixes[1] = "=~"; /* XXX - ?? */ | |
1089 | bash_tilde_suffixes[2] = (char *)NULL; | |
1090 | ||
1091 | tilde_additional_suffixes = bash_tilde_suffixes; | |
95732b49 JA |
1092 | |
1093 | bash_tilde_suffixes2 = strvec_create (2); | |
1094 | bash_tilde_suffixes2[0] = ":"; | |
1095 | bash_tilde_suffixes2[1] = (char *)NULL; | |
726f6388 | 1096 | } |
726f6388 JA |
1097 | } |
1098 | ||
f73dda09 JA |
1099 | /* POSIX.2, 3.6.1: A tilde-prefix consists of an unquoted tilde character |
1100 | at the beginning of the word, followed by all of the characters preceding | |
1101 | the first unquoted slash in the word, or all the characters in the word | |
1102 | if there is no slash...If none of the characters in the tilde-prefix are | |
1103 | quoted, the characters in the tilde-prefix following the tilde shell be | |
1104 | treated as a possible login name. */ | |
1105 | ||
1106 | #define TILDE_END(c) ((c) == '\0' || (c) == '/' || (c) == ':') | |
1107 | ||
1108 | static int | |
1109 | unquoted_tilde_word (s) | |
1110 | const char *s; | |
1111 | { | |
1112 | const char *r; | |
1113 | ||
1114 | for (r = s; TILDE_END(*r) == 0; r++) | |
1115 | { | |
1116 | switch (*r) | |
1117 | { | |
1118 | case '\\': | |
1119 | case '\'': | |
1120 | case '"': | |
1121 | return 0; | |
1122 | } | |
1123 | } | |
1124 | return 1; | |
1125 | } | |
1126 | ||
95732b49 JA |
1127 | /* Find the end of the tilde-prefix starting at S, and return the tilde |
1128 | prefix in newly-allocated memory. Return the length of the string in | |
1129 | *LENP. FLAGS tells whether or not we're in an assignment context -- | |
1130 | if so, `:' delimits the end of the tilde prefix as well. */ | |
1131 | char * | |
1132 | bash_tilde_find_word (s, flags, lenp) | |
1133 | const char *s; | |
1134 | int flags, *lenp; | |
1135 | { | |
1136 | const char *r; | |
1137 | char *ret; | |
1138 | int l; | |
1139 | ||
1140 | for (r = s; *r && *r != '/'; r++) | |
1141 | { | |
1142 | /* Short-circuit immediately if we see a quote character. Even though | |
1143 | POSIX says that `the first unquoted slash' (or `:') terminates the | |
1144 | tilde-prefix, in practice, any quoted portion of the tilde prefix | |
1145 | will cause it to not be expanded. */ | |
1146 | if (*r == '\\' || *r == '\'' || *r == '"') | |
1147 | { | |
1148 | ret = savestring (s); | |
1149 | if (lenp) | |
1150 | *lenp = 0; | |
1151 | return ret; | |
1152 | } | |
1153 | else if (flags && *r == ':') | |
1154 | break; | |
1155 | } | |
1156 | l = r - s; | |
1157 | ret = xmalloc (l + 1); | |
1158 | strncpy (ret, s, l); | |
1159 | ret[l] = '\0'; | |
1160 | if (lenp) | |
1161 | *lenp = l; | |
1162 | return ret; | |
1163 | } | |
1164 | ||
7117c2d2 JA |
1165 | /* Tilde-expand S by running it through the tilde expansion library. |
1166 | ASSIGN_P is 1 if this is a variable assignment, so the alternate | |
95732b49 JA |
1167 | tilde prefixes should be enabled (`=~' and `:~', see above). If |
1168 | ASSIGN_P is 2, we are expanding the rhs of an assignment statement, | |
1169 | so `=~' is not valid. */ | |
ccc6cda3 | 1170 | char * |
7117c2d2 | 1171 | bash_tilde_expand (s, assign_p) |
f73dda09 | 1172 | const char *s; |
7117c2d2 | 1173 | int assign_p; |
726f6388 | 1174 | { |
3185942a | 1175 | int old_immed, old_term, r; |
ccc6cda3 | 1176 | char *ret; |
726f6388 | 1177 | |
a0c0a00f | 1178 | #if 0 |
ccc6cda3 | 1179 | old_immed = interrupt_immediately; |
3185942a | 1180 | old_term = terminate_immediately; |
ac50fbac CR |
1181 | /* We want to be able to interrupt tilde expansion. Ordinarily, we can just |
1182 | jump to top_level, but we don't want to run any trap commands in a signal | |
1183 | handler context. We might be able to get away with just checking for | |
1184 | things like SIGINT and SIGQUIT. */ | |
1185 | if (any_signals_trapped () < 0) | |
1186 | interrupt_immediately = 1; | |
1187 | terminate_immediately = 1; | |
a0c0a00f | 1188 | #endif |
95732b49 JA |
1189 | |
1190 | tilde_additional_prefixes = assign_p == 0 ? (char **)0 | |
1191 | : (assign_p == 2 ? bash_tilde_prefixes2 : bash_tilde_prefixes); | |
1192 | if (assign_p == 2) | |
1193 | tilde_additional_suffixes = bash_tilde_suffixes2; | |
1194 | ||
f73dda09 JA |
1195 | r = (*s == '~') ? unquoted_tilde_word (s) : 1; |
1196 | ret = r ? tilde_expand (s) : savestring (s); | |
ac50fbac | 1197 | |
a0c0a00f | 1198 | #if 0 |
ccc6cda3 | 1199 | interrupt_immediately = old_immed; |
3185942a | 1200 | terminate_immediately = old_term; |
a0c0a00f | 1201 | #endif |
ac50fbac CR |
1202 | |
1203 | QUIT; | |
1204 | ||
ccc6cda3 | 1205 | return (ret); |
726f6388 | 1206 | } |
d166f048 JA |
1207 | |
1208 | /* **************************************************************** */ | |
1209 | /* */ | |
1210 | /* Functions to manipulate and search the group list */ | |
1211 | /* */ | |
1212 | /* **************************************************************** */ | |
1213 | ||
1214 | static int ngroups, maxgroups; | |
1215 | ||
1216 | /* The set of groups that this user is a member of. */ | |
1217 | static GETGROUPS_T *group_array = (GETGROUPS_T *)NULL; | |
1218 | ||
1219 | #if !defined (NOGROUP) | |
1220 | # define NOGROUP (gid_t) -1 | |
1221 | #endif | |
1222 | ||
d166f048 JA |
1223 | static void |
1224 | initialize_group_array () | |
1225 | { | |
1226 | register int i; | |
1227 | ||
1228 | if (maxgroups == 0) | |
1229 | maxgroups = getmaxgroups (); | |
1230 | ||
1231 | ngroups = 0; | |
1232 | group_array = (GETGROUPS_T *)xrealloc (group_array, maxgroups * sizeof (GETGROUPS_T)); | |
1233 | ||
1234 | #if defined (HAVE_GETGROUPS) | |
1235 | ngroups = getgroups (maxgroups, group_array); | |
1236 | #endif | |
1237 | ||
1238 | /* If getgroups returns nothing, or the OS does not support getgroups(), | |
1239 | make sure the groups array includes at least the current gid. */ | |
1240 | if (ngroups == 0) | |
1241 | { | |
1242 | group_array[0] = current_user.gid; | |
1243 | ngroups = 1; | |
1244 | } | |
1245 | ||
1246 | /* If the primary group is not in the groups array, add it as group_array[0] | |
1247 | and shuffle everything else up 1, if there's room. */ | |
1248 | for (i = 0; i < ngroups; i++) | |
1249 | if (current_user.gid == (gid_t)group_array[i]) | |
1250 | break; | |
1251 | if (i == ngroups && ngroups < maxgroups) | |
1252 | { | |
1253 | for (i = ngroups; i > 0; i--) | |
28ef6c31 | 1254 | group_array[i] = group_array[i - 1]; |
d166f048 JA |
1255 | group_array[0] = current_user.gid; |
1256 | ngroups++; | |
1257 | } | |
cce855bc JA |
1258 | |
1259 | /* If the primary group is not group_array[0], swap group_array[0] and | |
1260 | whatever the current group is. The vast majority of systems should | |
1261 | not need this; a notable exception is Linux. */ | |
1262 | if (group_array[0] != current_user.gid) | |
1263 | { | |
1264 | for (i = 0; i < ngroups; i++) | |
28ef6c31 JA |
1265 | if (group_array[i] == current_user.gid) |
1266 | break; | |
cce855bc JA |
1267 | if (i < ngroups) |
1268 | { | |
1269 | group_array[i] = group_array[0]; | |
1270 | group_array[0] = current_user.gid; | |
1271 | } | |
1272 | } | |
d166f048 JA |
1273 | } |
1274 | ||
1275 | /* Return non-zero if GID is one that we have in our groups list. */ | |
1276 | int | |
cce855bc JA |
1277 | #if defined (__STDC__) || defined ( _MINIX) |
1278 | group_member (gid_t gid) | |
1279 | #else | |
d166f048 JA |
1280 | group_member (gid) |
1281 | gid_t gid; | |
cce855bc | 1282 | #endif /* !__STDC__ && !_MINIX */ |
d166f048 JA |
1283 | { |
1284 | #if defined (HAVE_GETGROUPS) | |
1285 | register int i; | |
1286 | #endif | |
1287 | ||
1288 | /* Short-circuit if possible, maybe saving a call to getgroups(). */ | |
1289 | if (gid == current_user.gid || gid == current_user.egid) | |
1290 | return (1); | |
1291 | ||
1292 | #if defined (HAVE_GETGROUPS) | |
1293 | if (ngroups == 0) | |
1294 | initialize_group_array (); | |
1295 | ||
1296 | /* In case of error, the user loses. */ | |
1297 | if (ngroups <= 0) | |
1298 | return (0); | |
1299 | ||
1300 | /* Search through the list looking for GID. */ | |
1301 | for (i = 0; i < ngroups; i++) | |
1302 | if (gid == (gid_t)group_array[i]) | |
1303 | return (1); | |
1304 | #endif | |
1305 | ||
1306 | return (0); | |
1307 | } | |
1308 | ||
1309 | char ** | |
1310 | get_group_list (ngp) | |
1311 | int *ngp; | |
1312 | { | |
1313 | static char **group_vector = (char **)NULL; | |
1314 | register int i; | |
d166f048 JA |
1315 | |
1316 | if (group_vector) | |
1317 | { | |
1318 | if (ngp) | |
1319 | *ngp = ngroups; | |
1320 | return group_vector; | |
1321 | } | |
1322 | ||
1323 | if (ngroups == 0) | |
1324 | initialize_group_array (); | |
1325 | ||
1326 | if (ngroups <= 0) | |
1327 | { | |
1328 | if (ngp) | |
1329 | *ngp = 0; | |
1330 | return (char **)NULL; | |
1331 | } | |
1332 | ||
7117c2d2 | 1333 | group_vector = strvec_create (ngroups); |
d166f048 | 1334 | for (i = 0; i < ngroups; i++) |
7117c2d2 | 1335 | group_vector[i] = itos (group_array[i]); |
b72432fd | 1336 | |
d166f048 JA |
1337 | if (ngp) |
1338 | *ngp = ngroups; | |
1339 | return group_vector; | |
1340 | } | |
b72432fd JA |
1341 | |
1342 | int * | |
1343 | get_group_array (ngp) | |
1344 | int *ngp; | |
1345 | { | |
1346 | int i; | |
1347 | static int *group_iarray = (int *)NULL; | |
1348 | ||
1349 | if (group_iarray) | |
1350 | { | |
1351 | if (ngp) | |
1352 | *ngp = ngroups; | |
1353 | return (group_iarray); | |
1354 | } | |
1355 | ||
1356 | if (ngroups == 0) | |
1357 | initialize_group_array (); | |
1358 | ||
1359 | if (ngroups <= 0) | |
1360 | { | |
1361 | if (ngp) | |
1362 | *ngp = 0; | |
1363 | return (int *)NULL; | |
1364 | } | |
1365 | ||
1366 | group_iarray = (int *)xmalloc (ngroups * sizeof (int)); | |
1367 | for (i = 0; i < ngroups; i++) | |
1368 | group_iarray[i] = (int)group_array[i]; | |
1369 | ||
1370 | if (ngp) | |
1371 | *ngp = ngroups; | |
1372 | return group_iarray; | |
1373 | } | |
a0c0a00f CR |
1374 | |
1375 | /* **************************************************************** */ | |
1376 | /* */ | |
1377 | /* Miscellaneous functions */ | |
1378 | /* */ | |
1379 | /* **************************************************************** */ | |
1380 | ||
1381 | /* Return a value for PATH that is guaranteed to find all of the standard | |
1382 | utilities. This uses Posix.2 configuration variables, if present. It | |
1383 | uses a value defined in config.h as a last resort. */ | |
1384 | char * | |
1385 | conf_standard_path () | |
1386 | { | |
1387 | #if defined (_CS_PATH) && defined (HAVE_CONFSTR) | |
1388 | char *p; | |
1389 | size_t len; | |
1390 | ||
1391 | len = (size_t)confstr (_CS_PATH, (char *)NULL, (size_t)0); | |
1392 | if (len > 0) | |
1393 | { | |
1394 | p = (char *)xmalloc (len + 2); | |
1395 | *p = '\0'; | |
1396 | confstr (_CS_PATH, p, len); | |
1397 | return (p); | |
1398 | } | |
1399 | else | |
1400 | return (savestring (STANDARD_UTILS_PATH)); | |
1401 | #else /* !_CS_PATH || !HAVE_CONFSTR */ | |
1402 | # if defined (CS_PATH) | |
1403 | return (savestring (CS_PATH)); | |
1404 | # else | |
1405 | return (savestring (STANDARD_UTILS_PATH)); | |
1406 | # endif /* !CS_PATH */ | |
1407 | #endif /* !_CS_PATH || !HAVE_CONFSTR */ | |
1408 | } | |
d233b485 CR |
1409 | |
1410 | int | |
1411 | default_columns () | |
1412 | { | |
1413 | char *v; | |
1414 | int c; | |
1415 | ||
1416 | c = -1; | |
1417 | v = get_string_value ("COLUMNS"); | |
1418 | if (v && *v) | |
1419 | { | |
1420 | c = atoi (v); | |
1421 | if (c > 0) | |
1422 | return c; | |
1423 | } | |
1424 | ||
1425 | if (check_window_size) | |
1426 | get_new_window_size (0, (int *)0, &c); | |
1427 | ||
1428 | return (c > 0 ? c : 80); | |
1429 | } | |
1430 | ||
1431 |